Exclude non-triggering peaks when assigning main/alt peaks

[dachengx]

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What does the code in this PR do / what does it improve?

Stop S1/2 from being main/alt S1/2 if S1/2 is not included in triggering peaks. However, we should not apply this selection if we do not discriminate if S1 is triggering (exclude_s1_as_triggering_peaks = True).

Close: #1496

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